Helmets

- In-molded construction - TransTextura moisture-wicking, anti-odor inner padding - MIPS Protection - Optional visor on Path MTB helmet Sizing: - Small/Medium = 49 – 57cm - Medium/Large = 53 – 61cm

Loosely based upon the leather "hairnets" that cyclists used to wear before protection was a priority, we took their ventilation and classic style and incorporated them into a modern helmet design that combines aerodynamics, weight, aesthetics, and ventilation—the Airnet with MIPS. - Ultra-light Mindset micro-dial fit system with height adjustability for the perfect fit. - 4th Dimension Cooling System with deep internal channels, large vents, and aligned exhaust ports. - Composite matrix internal reinforcement allows larger vents for enhanced cooling. - drirelease Merino wool pads for increased comfort and sweat/ temperature management. - Vent grippers integrated at the front and rear for secure eyewear storage. - Thin, soft, and lightweight 4X DryLite webbing won’t stretch out with sweat or water. - Tri-Fix web splitter for improved comfort and ease of strap adjustments. - Instrap webbing system for ultra-light construction and security. - Reflective decals for increased visibility in low-light conditions. - MIPS-equipped.

FOR OFF-ROAD ADVENTURES An ideal off-road helmet for the first rides on uneven terrain. The MoTrip promises a high level of comfort for your rides over hill and dale. The deep fit of the MTB helmet ensures the best possible protection for the head. To make off-road rides more comfortable, the MoTrip is also equipped with the MTB adjustment system. This enable both individual size adjustment and height adjustability using the adjustment wheel at the back of the head. This is a great advantage for ponytail wearers, as they can make room for a ponytail by adjusting the height. Go on off-road adventures with the lightweight and well ventilated bike helmet or alternatively wear it for commuting. - In-Mould for a permanent bond between the outer shell and the shock-absorbing helmet material (EPS) - Zoom Ace MTB: Height-adjustable adjustment system to fit the head circumference - Ponytail compatibility: Helmet well suited for ponytail wearers - Adjustable strap divider - Height-adjustable visor - Ventilation: excellent ventilation through 6 air inlets and 8 air outlets

When ripping down the trail, the last thing you need to worry about is if your helmet will protect you in a crash. Then again, you don't want to be stuck wearing a full-face on every trail ride. This is why we created the Ambush, the lightest and most ventilated extended coverage helmet available. We've teamed up with MIPS researchers to introduce MIPS SL—a new, ultra-light, and supremely comfortable version of MIPS that's available exclusively on Specialized helmets. With MIPS SL, we've essentially integrated MIPS technology within the helmet padding itself. MIPS SL's minimalist "watchband" attachment system provides 10 to 15 millimeters of rotation in every direction and offers the same brain protection benefits as other versions of MIPS, while also ushering in a new level of comfort and weight savings. Starting with protection, the Ambush boasts a significant amount of extended coverage, Energy Optimized Multi-Density EPS foam that manages the energy from impacts effectively, and a Aramid-Reinforced Skeleton that provides extra structure for the foam. Even with the added protection, though, it fits comfortably with our low profile and fully integrated Mindset 360 fit system. With its five height positions, this system provides unmatched adjustment, while an integrated dial allows for on-the-fly tinkering. The Ambush also keeps you cool with our 4th Dimension Cooling System's massive vents and exhaust ports, so you don't have to worry about overheating—even on the hottest days. Finally, we included a micro-indexing visor that quickly adjusts positions and has plenty of room for goggle storage. Combined, these features put the Ambush well in front of the competition. Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older. - New MIPS SL is the lightest, most ventilated MIPS protection to date and is exclusively available on Specialized helmets. - Patented aramid-reinforced skeleton provides internal EPS support. - Patented Energy Optimized Multi-Density EPS construction helps to manage impact energy. - Mindset 360 fit system provides a secure, customizable fit with 360-degree tension adjustment, five height positions, and an integrated dial for easy, on-the-fly adjustments. - Micro indexing visor allows for a wide range of fast, secure on-trail adjustments, as well as convenient goggle stowage. - 4th Dimension Cooling System with massive vents, internal Cross-Channels, and aligned exhaust ports increases airflow to keep you cool. - Low profile in-molded shell with smooth, snag-free exterior shape. - Extended coverage for added protection and durability. - This helmet is ANGi ready, with a fit system mount designed for easy integration with our ANGi crash sensor. - Our available aftermarket ANGi sensor gives you and your loved ones peace of mind like never before. When combined with our Specialized Ride app, the ANGi sensor will evaluate the forces acting on the helmet in the event of an accident and, if necessary, send a text message to your specified contacts with your location. - Lightweight, quick-drying liner features a Gutter Action Brow that channels moisture away from eyes. - Tri-Fix web splitter for improved comfort and ease of strap adjustments.

ALLL-ROUND HELMET The Macator is a sporty entry-level helmet for cyclists looking for an outstanding all-round helmet. The Macator has not only a comfortable padding but also offers an excellent ventilation, and it comes in a variety of bright, highly-visible colors. In-Mold: Lightweight, durable helmet with a long-lasting combination of EPS core and Polycarbonate shell - Bug mesh: Full protection from insects - Ponytail compatibility: Perfect fit for people with long hair - Full-ring: Adjustable ring connected to adjustment system enclosing all of the head - Excellent ventilation with 5 air inlets and 8 air outlets - Zoom Ace: Finely adjustable adjustment system with handy adjustment wheel for customizable fit

The Macator is a sporty entry-level helmet for cyclists looking for an outstanding all-around helmet. The Macator not only has comfortable padding but also offers excellent ventilation. - In-Mold: Lightweight, durable helmet with a long-lasting combination of EPS core and Polycarbonate shell - Bug mesh: Full protection from insects - Ponytail compatibility: Perfect fit for people with long hair - Full-ring: Adjustable ring connected to adjustment system enclosing all of the head - Excellent ventilation with 5 air inlets and 8 air outlets - Zoom Ace: Finely adjustable fit system with handy adjustment wheel for a customizable fit Sizing: - Medium: 51-55cm - Large: 52-58cm - X-Large: 58-62cm

- Created for the performance rider who is seeking a professional riding experience - Designed from the beginning with ace aerodynamics applied for maximum ventilation with minimal construction - Strategically placed aerovent ports optimize airflow through the helmet, which improves aerodynamics and adds head-cooling ventilation - Element strap system (ESS) brings together Cinch Pro, Optimal Position Y, and Liteform webbing into one fit and retention system for superior fit - Low and high speed impact-tuned construction with optimized low-density EPS, and an ultra-thin toughened polycarbonate shell

- In-molded construction - TransTextura moisture-wicking, anti-odor inner padding - MIPS Protection Sizing: - Small/Medium = 49 – 57cm - Medium/Large = 53 – 61cm

Fulfill your need for road speed with Kali's Loka Helmet. It's got Composite Fusion Plus technology for exceptional strength and impact force distribution, not to mention a layer of pyramid EPS cones for even more toughness. The Micro Fit system snugs up tight and comfy around your head so nicely you'll forget you're even wearing a lid. Loaded with top-end features, the Loka is sure to fulfill your need for speed. - Sizing: S/M (54-58 CM) M/L (58-62 CM)

The Ropa is Kali’s introductory level road helmet, driven by its ultra lightweight polycarbonate shell and in-mold construction, delivered at a reasonable price point. PRODUCT FEATURES: - Composite Fusion: In-molding technology, merging the shell and EPS foam liner. Better impact energy management, increased dynamic range - smaller, lighter and stronger. - Micro-fit closure system - Certified to: EN 1078, CPSC - Sizes: S/M (52-58 CM) M/L (58-62 CM)

Pioneering technology doesn’t stop with revolutionizing the way helmets are built. Kali also has a social responsibility to contribute to the investigation and use of alternate materials that reduce the impact of helmets on the environment. The Saha Commuter helmet with Bio-Dome construction uses renewable, bio-based, recycled and non-solvent based raw materials. Most importantly, unlike other fabrics such as nylon or polyester, Bio-Dome construction avoids the use of petroleum based fabrics and instead, using 100% non-bleached natural cotton and flax fabrics. The Saha Commuter helmet features a polylactide and ABS blend outer shell. Polylactide is a corn-based, renewable polymer that is easily thermoformed into a helmet shell. The production process of PLA does not produce toxic by-products. The Saha Commuter also includes 100% recycled expanded polystyrene foam, a high grade shock absorbing foam that is compressed and reconstituted, to ensure a sturdy and reliable helmet. PRODUCT FEATURES: - Outer shell is made of a polylactide and ABS blend (corn based) - 100% recycled expanded polystyrene material - 100% natural non-bleached cotton & flax fabrics - Water-based coating - Dial Fit System for optimum fit - Washable, adjustable, anti-microbial fit pads - Certified to: EN 1078, CPSC - Sizing: S/M (55-58 CM) L/XL (58-61 CM)

Kali's Maraka Road Helmet will have you thinking about victory thanks to its low weight, strength, and head-hugging design. It all starts with the Composite Fusion Plus build that distributes forces from impacts efficiently; added strength comes from the carbon/polycarbonate construction for stellar durability no matter what conditions you ride in. Everyone likes a solid, comfy fit, which is why the Maraka features a Bumper Fit system comprised of an absorbent polymer material, not to mention a Dual Closure system that wraps around your dome like a soft bear hug. You'll still be able to feel the wind whip through your hair though thanks to Supervent technology with strength reinforcements around major vents. The included bug liner keeps out stowaways, too.

The Saha is a very eco-friendly urban helmet featuring Bio-Dome construction, recycled EPS, and natural fabrics. The PLA-ABS blended shell, removable visor, and Fidlock buckle make the Saha an unapologetically tough and versatile helmet for any commute. - Technology : Bio-Dome - Features: Fidlock Snap Buckle, Snap-Fit Removable Visor, 100% Cotton Pads, Locking Sliders - Material: ABS-PLA Blended Shell, Recycled EPS Foam, Water-Based Paint - Vents: 11 - Weight: 296g / 10.4oz - Certification: EN 1078, CPSC, AS/NZS 2063-2008 - Intended Use: Commute, Recreational - Small/Medium = 55 – 58cm - Large/X-Large = 58 – 61cm

The FeatherWeight features In-Mold technology to make a custom shape and fit utilizing a thin outer shell that covers and protects high-density EPS foam. - High density EPS in-mold construction - Tested and certified for CPSC and EN 1078 standards for bicycle use - Two sets of padding included for custom fitting - Crow rivets and 10 flow-vents to keep cool - Small/Medium = 50 – 56cm - Large/X-Large = 58 – 61cm

Clean aesthetic, comfortable fit, and a budget-friendly price—that's what makes up the Align II. The standout feature of the Align II is the inclusion of the Multi-Directional Impact Protection System (MIPS), a patented technology designed to mitigate against rotational forces transmitted to the brain during certain angled impact scenarios. In addition, the Align II became the only $50 helmet to earn the highest Five Star rating from the independent testing done at the renowned Virginia Polytechnic Institute and State University. When including MIPS and earning this Five Star Virginia Tech Helmet Rating we didn't give up any comfort—the Align II includes the Headset SX dial fit system for easy fit adjustment, our 4th Dimension Cooling System for incredible ventilation, and an easy one-size fit system. If you're on the quest for a feature-rich helmet that leaves some jingle jangle in your pocket, the Align II is for you. Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older. - Align II earned the highest 5-Star Virginia Tech Helmet Rating from internationally renowned Virginia Polytechnic Institute and State University. - The MIPS system is a low-friction layer that allows a sliding motion of 10 to 15mm in all directions. Studies indicate that this reduces some of the rotational forces transmitted to the brain during angled impacts. - Easily-adjustable, one-size Headset SX fit system is designed for easy and accurate fit for a wide range of head sizes. Add in a micro-adjustable dial for on-the-fly adjustability and you're ensured an easy, secure, and accurate fit. - 4th Dimension Cooling System optimizes ventilation. - In-molded shell improves strength and reduces weight. - Reflective decals for increased visibility in low-light conditions.

The MET Echo MIPS is an entry-level MTB helmet high in quality and protection. It’s a perfect choice for those who are just beginning their adventures on the trails. The construction of the helmet offers the same technology and safety, with increased coverage around the back of the head. Featuring the MIPS-C2 brain protection system, the Echo is able to slide against the head in the case of a crash, redirecting damaging rotational motion. - In-mold polycarbonate shell with EPS liner - Fully polycarbonate wrapped EPS liner enhances durability - Extended head coverage for more thorough head protection - MIPS-C2 Brain Protection System offers extra protection in the case of certain impacts - MET Safe-T Mid Fit System - The 360° head belt reduces pressure points on the perimeter of the head - The removable visor with hidden anchors ensures maximum versatility - Hand washable comfort pads - Straps with an adjustable divider provide a customized fit - 14 vents are internally engineered for air channeling to improve ventilation and comfort - Reflective rear sticker - Certifications CE; AS/NZS Sizing: - Small/Medium = 52 – 57cm - Medium/Large = 57 – 60cm - Large/X-Large = 60 – 64cm

The Kali Protectives Maya 3.0 is an upgraded version of Kali's best-selling Maya helmet. It includes new features such as a dial retention fit system, added venting, and a newly designed visor. - LDL (Low Density Layer) technology is used throughout the interior of the helmet to reduce rotational impact forces up to 25%, and reduce low-g linear forces up to 30% - Composite Fusion Plus technology incorporates layers of multi-density cone shaped EPS foam to absorb different levels of impact and direct energy sideways and away from the brain - Removable/washable liner - Anti-microbial pads - Flex moto-style visor - Bug liner - Locking buckle and sliders - Dial rention fit system

You need to get out on your bike even in terrible weather. Fitting in an early commute or a mid-winter ride is easier when you're warm, comfortable, and visible. Keeping your head warm in bad weather can be the best way to fend off the elements. - GORE-TEX Product: durably waterproof, windproof and extremely breathable - Reflective band - Elastic hem - Reflective logo - Durably waterproof - Extremely breathable - All weather conditions - Engineered for Cycling - Weight: 0.8 ounces

This race-inspired design is known for its incredible fit and tremendous value. It has many similar features to the S-Works Prevail, like the Tri-Fix webbing system and 4th Dimension Cooling, granting the Propero III incredible performance at a more attainable price. - MIPS-equipped. - Easy-adjust, HairPort FSL II fit system with four height positions and micro-adjustable dial. - 4th Dimension Cooling System with Mega Mouthport for enhanced comfort. - Composite matrix internal reinforcement allows larger vents for greater cooling. - Soft 4X DryLite webbing material won’t stretch out with sweat or water. - Tri-Fix web splitter for improved comfort and ease of strap adjustments. - This helmet is ANGi ready, with a fit system mount designed for easy integration with our ANGi crash sensor. - Our available aftermarket ANGi sensor gives you and your loved ones peace of mind like never before. When combined with our Specialized Ride app, the ANGi sensor will evaluate the forces acting on the helmet in the event of an accident and, if necessary, send a text message to your specified contacts with your location.

Be so bold in the all-new Ambush 2. Fully redesigned from the buckle up with essential features for next-gen trail riding, the Ambush 2 channels ample ventilation through modern styling, with a superb fit and dialed eyewear integration. - Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older. - Sized to drop in with a highly customizable fit and precision adjustment. The Ambush 2 features our SBC Integrated Fit system and adjustable Tri-Fix splitters to provide a dialed fit. - Fine-tune your vision using the Ambush 2’s Occipital Base Adjustment to precisely adjust how the helmet sits on the brow for seamless integration with goggles and glasses for an unrestricted view down the trail. - Innovative sunglasses storage with hidden rubber flaps maintains a secure, rattle-free fit, keeping your glasses safely stored when you need to get them out of the way during long climbs or moments of rest. - Computational Fluid Dynamic design integrates the maximum volume of internal channeling for optimal airflow through the helmet, drawing heat away from the head. 4D brow cooling, which provides a gap between the helmet and forehead, draws airflow into internal air channels at every speed. - Integrated fixed visor with a breakaway feature provides increased trail vision and a seamless interface with eyewear while effectively channeling airflow through the helmet for superb ventilation. - Strategically optimized dual-density EPS foam eliminates bulk and reduces excess weight. - The Ambush 2 earned the highest 5-Star Virginia Tech Helmet Rating from the internationally renowned Virginia Polytechnic Institute and State University. - Features the MIPS SL solution with our exclusive perforated backing. Integrating MIPS technology within the helmet padding reduces moisture retention while increasing breathability. - This helmet is ANGi ready, with a fit system mount designed for easy integration with our ANGi crash sensor. - Average weight: 360 grams (medium).

It's All in Your Tactic. With an unprecedented combination of fit, ventilation, and confidence for trail and enduro riding, the Tactic helmet delivers exceptional coverage and seamless integration with goggles or glasses. Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older. - Tune a more precise, personalized fit thanks to Tactic's slim, incredibly adjustable Integrated Fit System that accommodates variations in head shape and occipital base. - Occipital base adjustment personalizes fit for comfort and allows you to tune helmet angle to ensure that your helmet and eyewear stay perfectly synched. - Integrated fixed visor provides increased trail vision and a seamless interface with eyewear. Specifically designed eyewear channels always give you a spot to store your glasses at a moment's notice. - Average weight: 380 grams (medium). - Computational Fluid Dynamic design integrates the maximum volume of internal channeling for optimal airflow through the helmet drawing heat away from the head. 4D brow cooling which provides a gap between the helmet and forehead, draws airflow into internal air channels at every speed. - Whether your riding acoustic or e-MTB, the Tactic is certified to NTA 8776. - The Tactic earned the highest 5-Star Virginia Tech Helmet Rating from the internationally renowned Virginia Polytechnic Institute and State University. - Fitted with a MIPS Evolve solution. - Integrated fit system allows for extended (occipital) coverage. - This helmet is ANGi ready, with a fit system mount designed for easy integration with our ANGi crash sensor.

It's All in Your Tactic. With an unprecedented combination of fit, ventilation, and confidence for trail and enduro riding, the Tactic helmet delivers exceptional coverage and seamless integration with goggles or glasses. - Tune a more precise, personalized fit thanks to Tactic's slim, incredibly adjustable Integrated Fit System that accommodates variations in head shape and occipital base. - Occipital base adjustment personalizes fit for comfort and allows you to tune helmet angle to ensure that your helmet and eyewear stay perfectly synched. - Integrated fixed visor provides increased trail vision and a seamless interface with eyewear. Specifically designed eyewear channels always give you a spot to store your glasses at a moment's notice. - 380 grams (medium) of lightweight performance. - Computational Fluid Dynamic design integrates the maximum volume of internal channeling for optimal airflow through the helmet drawing heat away from the head. 4D brow cooling, which provides a gap between the helmet and forehead, draws airflow into internal air channels at every speed. - Whether you're riding acoustic or e-MTB, the Tactic passes the e-bike Standard NTA8776 so you can can send it with confidence on whatever bike choice you make. - The Tactic earned the highest 5-Star Virginia Tech Helmet Rating from the internationally renowned Virginia Polytechnic Institute and State University. - Fitted with a MIPS Evolve solution to provide 10 to 15 millimeters of rotation in every direction. - Integrated fit system allows for extended (occipital) coverage. - This helmet is ANGi ready, with a fit system mount designed for easy integration with our ANGi crash sensor. Sizing: - Small = 51 – 56cm - Medium = 55 – 59cm - Large = 58 – 62cm

If your little one is likely to go big, before they go home, you might want to put them in the new Chakra Youth Plus. We have added a layer of our QuadCore—an LDL layer—to the original, making it a great choice for little shredder in your life. - Anti-bacterial pads - Break-Away visor - Dial-fit closure system Material: - EPS Foam - PC shell Certifications: - CPSC - EN 1078 Sizing: - One size

The MET Downtown MIPS is a truly modern touring helmet, ready for a weekend trek or the daily bicycle lane. The internal air-channeling and large number of vents provide exceptional ventilation. The 360° head belt and lightweight design ensures that there will be no pressure points on the skull. Featuring the MIPS-C2 rotational management system, the Downtown is able to slide against the head in the case of a crash, redirecting damaging rotational motion. MIPS is engineered to add extra safety to the standard construction of helmets in case of certain impacts. The MIPS Brain Protection System (BPS) is attached inside the helmet, between the comfort padding and the EPS. - In-mold polycarbonate shell with EPS liner - MIPS-C2 Brain Protection System offers extra protection in the case of certain impacts - Safe-T Twist 2 Fit System - 360° head belt and vertical adjustments offer a customized fit - Straps with an adjustable divider provide a customized fit - Reflective rear decal to enhance visibility - 17 vents are internally engineered for air channeling to improve ventilation and comfort - Comfort pads are hand-washable - CE; AS/NZS; US Sizing: - Small/Medium = 52 – 58cm - Medium/Large = 58 – 61cm

Immortalize your ride with Kali's camera-ready Amara Helmet. It's got a camera mount integrated into the top so you can grab footage of your favorite kicker or gap. Any helmet that's named after the Sanskrit word for 'immortal' is undoubtedly strong, and the Amara lives up to that and more thanks to a lightweight polycarbonate shell and an EPS liner bonded together with in-mold technology. The expanded rear coverage is awesome for all-mountain shredders, but fret not: there's plenty of air flow to keep you cool and bug netting to keep out stowaways. Everything stays comfortably in place, too, thanks to the Dual Closure system that wraps your head in the best kind of bear hug.

The Chakra Plus builds on the wildly successful Chakra line of helmets. Featuring Composite Fusion, a lower polycarbonate wrap and an integrated bug liner for those fast turns you just earned. - Technology: Composite Fusion - Features: Break-away Visor, Anti-Microbial Pads, Bug Liner, Locking Sliders - Material: PC Shell & Under Wrap, EPS Foam - Vents: 25 - Weight: 296g / 10.4oz - Certification: EN 1078, CPSC, AS/NZS 2063-2008 - Intended Use: Recreational, X-Country, Trail - X-Small/Small = 50 – 54cm - Small/Medium = 54 – 58cm - Large/X-Large = 58 – 62cm

The Serfas Incline Enduro is designed with lots of ventilation (18 vents) to help keep air flowing and make sure you stay nice and cool. In-mold construction provides strong impact protection while adjustable straps and rear easy-to-adjust fit system knob makes sure your helmet stays properly snug. - Enduro Fit - In-Mold Construction - Adjustable Straps - Removable Visor - Easy-To-Adjust Fit System (Rear Knob) - Integrated Bug Net - Vent Count: 18

For maximum safety, the Viantor has the ActiCage structural reinforcement integrated into the EPS. It provides maximum protection while ensuring optimal ventilation and extreme comfort. - ActiCage allows for large ventilation openings without compromising the helmet's safety - Multi Shell In-Mold for durable bonding of multi-part outer shell and shock-absorbing helmet material (EPS) - Good ventilation with 4 air inlets and 14 air outlets connected with flow channels - Zoom Ace fit system with a non-slip adjustment wheel - Semi-enclosing plastic ring connected to the adjustment system for optimum stability and fit - Ponytail-compatible and well suited for braided hairstyles Sizing: - Small: 51 – 55cm - Medium: 52 – 58cm - Large: 58 – 63cm

The Hyban 2.0 combines a particularly robust, hard shell with huge air intakes. In combination with the bright, integrated LED rear light, the Hyban 2.0 is the perfect everyday helmet for the city. - ABS hard shell: Robust helmet made of EPS foam and injection molded outer shell - High visibility: High visibility due to reflectors - Bug mesh: Full protection from insects - Ponytail compatibility: Perfect fit for people with long hair - Full-ring: Adjustable ring connected to adjustment system enclosing all of the head - Excellent ventilation with 5 air inlets and 8 air outlets - Zoom Ace Urban: Finely adjustable adjustment system with handy adjustment wheel for a customizable fit - Large, high-mounted, and integrated LED taillight with 180° visibility Sizing: - Medium: 52-58cm - Large: 56-61cm - X-Large: 58-63cm

The Scraper 3.0 is just as much at home on the bike as in the halfpipe, protecting the BMX rider as reliably as the longboard fan. And, with the optional winter kit, you can get after it in all types of weather. The intelligent ventilation system, with its many inlets and outlets, and the numerous adjustment options that adapt the Scraper 3.0 to each head in a few easy steps, ensure the greatest possible comfort. - ABS hard-shell technology - High visibility due to powerful reflectors - Ponytail compatibility: Helmet well suited to plait wearers - Forced Air Cooling Technology: Sophisticated ventilation system for an optimal head climate - Excellent ventilation with 4 air inlets and 4 air outlets - Size adjustment by means of a half-ring made from particularly hard-wearing and slightly malleable plastic for optimal stability and fit - Zoom Ace Urban: Finely adjustable fit system with a handy adjustment wheel Sizing: - Medium: 54 – 58cm - Large: 57 – 62cm